Vampire

A few days ago I was using artificial intelligence to distract myself and it came to mind to answer a concern,how strong the slayer is ? the general idea the slayer is stronger than most vampires.

But there are no official numbers, then use as a reference two episodes where you see what a slayer can do with her strength.

So using artificial intelligence to calculate the Slayer’s strength, it was used as a reference, the episode where Buffy deforms bars from a prison cell and the episode where Buffy momentarily lifts a medium-sized portico.

AI determined the Slayer has enough strength to lift 1 ton.

Heinrich Joseph Nest

Heinrich, a name of German origin, Enrique in Spanish.

And the last name, Nest of Netherlands origin.

So the master is a vampire from northwest Europe. Maybe from Netherlands

Why Xin Rong martial art is defined as lesser degree? In her wiki page

She subdues Spike and nearly kills him.

It's kind of confusing but what really happens to Spike? does he regain his soul and become a human half vampire? or just regain your soul and weaken?

look, I know this thing is complex, but I don't remember seeing it in the bufyverse, only in another series that I find this topic interesting, can witches lose their magical powers if they become vampires in the buffyverse? Could they be both? Witch and Vampire or is it impossible? Or even unnatural witches like Willow who became one could happen? Or would she just turn into a regular vampire?